The quipus form the clearest example, and the long history of knot amulets suggests that they may have been intended primarily to play precisely the same part that the various parts or chapters of the Book of the Dead played. The equally extensive use, however, of knots for records or reminders, as in the mnemonic fringes, allows the possibility of the individual personal record, and there is, of course, also the possibility that the graves in which they were found were the graves of tribal recorders or reciters who carried with them the implements of their trade in the same spirit that the hunting weapons were carried, or, on the other hand, in the spirit of the suicide of a king’s servants that they might serve him in the other world, and of the Ushabtiu substitutes for this. These models of servants, boats, war implements, and the like, in graves seem to be precisely analogous to the miniatures substituted for actual objects in votive offerings. Burial with the dead of a person’s favorite belongings has also to be reckoned with in interpreting these collections. Sometimes all a man’s favorite possessions were buried with him, and it not infrequently happens in modern civilized times that a person has a favorite ornament or possession buried with him. It was only yesterday that a man provided for having his cremated body sunk in his favorite yacht. § 18. _Contents of primitive libraries_ The various kinds of documents in the several sorts of primitive writing found in the different species of collections have been indicated under the various headings. It is worth while however to gather these up together a little and especially in view of the question of actual origin. It has been noted that collections of quipu, message sticks, fetishes, personal ornaments, skin calendars, totems, votive objects and other pictorial or mnemonic records in temples, graves, medicine tents, private wigwams, etc., include, in pre-phonetic times, records of personal exploits and events in personal history, family histories, and tribal histories, hymns, prayers, amulets, financial accounts, and economic records of various sorts, annual registers, contracts, astronomical observations, etc.